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MCQOPTIONS
This section includes 843 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science and Manufacturing Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
During the turning of a 20 mm diameter steel bar at a spindle speed of 400 rpm, a tool life of 20 minute is obtained. When the same bar is turned at 200 rpm, the tool life becomes 60 minute. Assume that Taylor's tool life equation is valid. When the bar is turned at 300 rpm, the tool life (in minute) is approximately ____ . |
| A. | 25 |
| B. | 32 |
| C. | 40 |
| D. | 50 |
| Answer» C. 40 | |
| 352. |
A threaded nut of M 16, ISO metric type, having 2 mm pitch with a pitch diameter of 14.701 mm is to be checked for its pitch diameter using two or three number of balls or rollers of the following sizes |
| A. | Rollers of 2 mm |
| B. | Rollers of 1.155 mm |
| C. | Balls of 2 mm |
| D. | Balls of 1.155 mm v |
| Answer» C. Balls of 2 mm | |
| 353. |
Which one of the following instruments is widely used to check and calibrate geometric features of machine tools during their assembly? |
| A. | Ultrasonic probe |
| B. | Coordinate Measuring Machine (CMM) |
| C. | Laser interferometer |
| D. | Vernier calipers |
| Answer» D. Vernier calipers | |
| 354. |
Metric thread of 0.8 mm pitch is to be cut on a lathe. Pitch of the lead screw is 1.5 mm. If the spindle rotates at 1500 rpm, the speed of rotation of the lead screw (rpm) will be________. |
| A. | 900 |
| B. | 700 |
| C. | 800 |
| D. | 400 |
| Answer» D. 400 | |
| 355. |
Abbe's principle of alignment states that the scale axis must coincide with line. |
| A. | False |
| B. | True |
| C. | False and True |
| D. | None of these |
| Answer» B. True | |
| 356. |
Outside micrometer is calibrated with the help of |
| A. | inside micrometer |
| B. | depth micrometer |
| C. | ring gauges |
| D. | slip gauges |
| Answer» E. | |
| 357. |
Which of the following materials requires the largest shrinkage allowance, while making a pattern for casting |
| A. | Aluminium |
| B. | Brass |
| C. | Cast iron |
| D. | Plain carbon steel |
| Answer» C. Cast iron | |
| 358. |
For angle measurement in metrology, the following pair can be used in conjunction with each other |
| A. | sine bar and vernier calipers |
| B. | bevel protractor and slip gauges |
| C. | slip gauges and sine bar |
| D. | sine bar and bevel protractor |
| Answer» D. sine bar and bevel protractor | |
| 359. |
Circular arc on a part profile is being machined on a vertical CNC milling machine, CNC part program using metric units with absolute dimensions is listed below: |
| A. | (30, 55) |
| B. | (50, 55) |
| C. | (50, 35) |
| D. | (30, 35) |
| Answer» E. | |
| 360. |
Using the Taylor's tool life equation with exponent n = 0.5, if the cutting speed is reduced by 50%, the ratio of new tool life to original tool life is |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | 0.5 |
| Answer» B. 2 | |
| 361. |
Flatness of slip gauges is checked with |
| A. | Interferometer |
| B. | Optical flat |
| C. | Electronic comparator |
| D. | Linear bar and bevel protractor |
| Answer» B. Optical flat | |
| 362. |
Centrifugally casted products have |
| A. | large grain structure with high porosity |
| B. | fine grain structure with high density |
| C. | fine grain structure with low density |
| D. | segregation of slug toward the outer skin of the casting |
| Answer» C. fine grain structure with low density | |
| 363. |
Control of group of NC machine by a supervisory computer is known as... control. |
| A. | DNC |
| B. | NC |
| C. | DC |
| D. | DCA |
| Answer» B. NC | |
| 364. |
Feed motion can be provided with stepper motors in CNC |
| A. | lathe |
| B. | drilling machine |
| C. | milling machine |
| D. | grinding machine |
| Answer» C. milling machine | |
| 365. |
A 2(1/2 ) axis control in a typical CNC machine provides |
| A. | simultaneous tool movements along 2 axes |
| B. | programmable movement along 3 axes but allow simultaneous movement along 2 axes |
| C. | simultaneous programmable movement along 3 axes in both directions |
| D. | simultaneous programmable movement along 3 axes but only in one direction |
| Answer» C. simultaneous programmable movement along 3 axes in both directions | |
| 366. |
The most common interpolation methods in continuous path NC machining are |
| A. | linear and circular |
| B. | linear and parabolic |
| C. | circular and parabolic |
| D. | circular and elliptic |
| Answer» B. linear and parabolic | |
| 367. |
Electrochemical grinding removes material by... A... And... B... processes. |
| A. | A. (chemical ) and B. (Mechanical) |
| B. | A. (Electrochemical) and B. (chemical ) |
| C. | A. (Electrochemical) and B. (Mechanical) |
| D. | A. (chemical ) and B. (chemical ) |
| Answer» D. A. (chemical ) and B. (chemical ) | |
| 368. |
A. CNC1. Zero inventoryB. MRP2. Rout sheetC. JIT3. DNCD. FMS4. Cutter path5. Lumped demand |
| A. | A 2, B 5, C 1, D 3. |
| B. | A 4, B 5, C 1, D 2. |
| C. | A 4, B 5, C 1, D 3. |
| D. | A 4, B 5, C 2, D 3. |
| Answer» D. A 4, B 5, C 2, D 3. | |
| 369. |
A DC servomotor is directly driving an NC table. The pitch of the lead screw of the table is 5 mm. The motor rotates at 100 rpm for an applied voltage of 10 V. If the voltage speed characteristic of the motor is linear, the applied voltage for a table of 3 m/min is equal to |
| A. | 30 V |
| B. | 60 V |
| C. | 33 V |
| D. | 50 V |
| Answer» C. 33 V | |
| 370. |
In DNC each machine tool is controlled by a dedicated computer. |
| A. | True |
| B. | False |
| C. | False and True |
| D. | None of these |
| Answer» B. False | |
| 371. |
Which one of the following process conditions leads to higher MRR in ECM? |
| A. | Higher current, large atomic weight |
| B. | Higher valency, lower current |
| C. | Lower atomic weight, lower valency |
| D. | Higher valency, lower atomic weight |
| Answer» B. Higher valency, lower current | |
| 372. |
Average power input (in kW) is |
| A. | 0.373 |
| B. | 0.137 |
| C. | 0.218 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 373. |
The time for one cycle, in milliseconds, is |
| A. | 0.55 |
| B. | 0.32 |
| C. | 0.89 |
| D. | 0.24 |
| Answer» B. 0.32 | |
| 374. |
Only 4 pairs can be matched Casting process |
| A. | A 4, B 3, C 2, D 5 |
| B. | A 2, B 3, C 2, D 5 |
| C. | A 1, B 3, C 2, D 4 |
| D. | A 2, B 5, C 2, D 1 |
| Answer» C. A 1, B 3, C 2, D 4 | |
| 375. |
Casting process |
| A. | A 5, B 3, C 2, D 4 |
| B. | A 4, B 5, C 2, D 3 |
| C. | A 4, B 3, C 2, D 5 |
| D. | A 2, B 5, C 4, D 3 |
| Answer» D. A 2, B 5, C 4, D 3 | |
| 376. |
In a green sand moulding process, uniform ramming leads to |
| A. | less chance of gas porosity |
| B. | uniform flow of molten into the mould cavity |
| C. | greater dimensional stability of the casting |
| D. | less sane expansion type of casting defect |
| Answer» C. greater dimensional stability of the casting | |
| 377. |
A casting of size 100 mm 100 mm 50 mm is required. Assume volume shrinkage of casting as 2.6%. If the height of the riser is 80 mm and riser volume desired is 4 times the shrinkage in casting, what is the appropriate riser diameter in mm? |
| A. | 14.38 |
| B. | 20.34 |
| C. | 28.76 |
| D. | 57.52 |
| Answer» B. 20.34 | |
| 378. |
In a binary system of A and B a liquid of 20% A (80% B) is coexisting with a solid of 70% A(30%B). For an overall composition having 40% A the fraction of solid is |
| A. | 0.40 |
| B. | 0.50 |
| C. | 0.60 |
| D. | 0.75 |
| Answer» B. 0.50 | |
| 379. |
If the z-axis and x-axis of CNC lathe are provided with straight line controls, it is possible to carry out |
| A. | Turning and facing only |
| B. | Turning, facing and taper turning |
| C. | turning, facing and thread cutting |
| D. | Turning, facing and drilling |
| Answer» C. turning, facing and thread cutting | |
| 380. |
Match the following part programming codes with their respective functions |
| A. | P-II, Q-I, R-IV, S-III |
| B. | P-IV, Q-II, R-III, S-I |
| C. | P-IV, O-III, R-II, S-I |
| D. | P-III, Q-IV, R-II, S-I |
| Answer» D. P-III, Q-IV, R-II, S-I | |
| 381. |
In a CNC milling operation, the tool has to machine the circular arc from point (20, 20) to (10, 10) at sequence number 5 of the CNC part program. If the center of the arc is at (20,10) and the machine has incremental mode of defining position coordinates, the correct tool path command is |
| A. | N05 G90 G01 X-10 Y-10 R10 |
| B. | N05 G91 G03 X-10 Y-10 R10 |
| C. | N05 G90 G03 X20 Y20 R10 |
| D. | N05 G91 G02 X20 Y20 R10 |
| Answer» C. N05 G90 G03 X20 Y20 R10 | |
| 382. |
In solid-state welding, the contamination layers between the surfaces to be welded are removed by |
| A. | alcohol |
| B. | plastic deformation |
| C. | water jet |
| D. | sand blasting |
| Answer» C. water jet | |
| 383. |
A block of length 200 mm is machined by a slab milling cutter 34 mm in diameter. The depth of cut and table feed are set at 2 mm and 18 mm/minute, respectively. Considering the approach and the over travel of the cutter to be same, the minimum estimated machining time per pass is minutes. |
| A. | 14 |
| B. | 13 |
| C. | 12 |
| D. | 23 |
| Answer» D. 23 | |
| 384. |
Find the speed range ratio for the drilling machine spindle if the minimum and maximum diameters of drills used are 5 mm and 25 mm respectively and if the mach inability indices for the work materials are 120 (brass) and 40 (alloy steel) |
| A. | 3/5 |
| B. | 5/3 |
| C. | 5 |
| D. | 15 |
| Answer» C. 5 | |
| 385. |
A grinding wheel is said to be glazed if |
| A. | grains have become blunt, but do not fall out |
| B. | gap between the grains is filled by dwarf |
| C. | it becomes black due to burning |
| D. | part of the wheel is chipped off |
| Answer» B. gap between the grains is filled by dwarf | |
| 386. |
If the index crank of a dividing head is turned through one complete revolution and 10 holes in a 30 hole Circle plate, the work piece turns through (in degrees) |
| A. | 6 |
| B. | 12 |
| C. | 240 |
| D. | 480 |
| Answer» C. 240 | |
| 387. |
Minimum dimensional and form accuracy can be obtained in the cylinder bores of automobile engines if the bores are finished by |
| A. | Lapping |
| B. | Reaming |
| C. | Internal grinding |
| D. | Honing |
| Answer» E. | |
| 388. |
Teeth of internal spur gears can be accurately cut in a |
| A. | Milling machine |
| B. | Gear shaping machine |
| C. | Slotting machine |
| D. | Hobbing machine |
| Answer» C. Slotting machine | |
| 389. |
Gear hobbing produces more accurate gears than milling because in hobbing |
| A. | there is a continuous indexing operation |
| B. | pressure angle is larger than in milling |
| C. | hob and work piece both are rotating |
| D. | a special multi-tooth cutter (hob) is used |
| Answer» E. | |
| 390. |
The binding material used in cemented carbide cutting tools is |
| A. | Graphite |
| B. | Tungsten |
| C. | Nickel |
| D. | Cobalt |
| Answer» E. | |
| 391. |
In a grinding wheel marked with AA-48-L-7-V- 25, L refers to |
| A. | abrasive type |
| B. | wheel structure |
| C. | wheel hardness |
| D. | manufactures code |
| Answer» D. manufactures code | |
| 392. |
A drilling machine has to be designed with 8 spindle speeds ranging approximately between 120 to 1200 rpm. The 5th spindle speed is |
| A. | 445 |
| B. | 480 |
| C. | 620 |
| D. | 865 |
| Answer» B. 480 | |
| 393. |
A through hole is drilled in an aluminium alloy plate of 15 mm thickness with a drill bit of diameter 10 mm, at a feed of 0.25 mm/rev and a spindle speed of 1200 rpm. If the specific energy required for cutting this material is 0.7 N-m/ mm |
| A. | 274.89 |
| B. | 374.89 |
| C. | 274.99 |
| D. | 274 |
| Answer» B. 374.89 | |
| 394. |
The length, width and thickness of a steel sample are 400 mm, 410 mm, 40 mm and 20 mm, respectively. I ts thickness needs to be uniformly reduced by 2 mm in a single pass by using horizontal slab miling. The miling cutter (diameter: 100 mm, width; 50 mm) has 20 teeth and rotates at 1200 rpm. The feed per tooth is 0.05 mm. The feed direction is along the length of the sample. If the over-travel distance is the same as the approach distance, the approach distance and time taken to complete t he required machining task are: |
| A. | 21 mm, 39.4 s |
| B. | 14 mm, 18.4 s |
| C. | 14 mm, 21.4 s |
| D. | 21 mm, 28.9 s |
| Answer» D. 21 mm, 28.9 s | |
| 395. |
Within the Heat Affected Zone (HAZ) in a fusion welding process, the work material undergoes |
| A. | micro structural changes but does not melt |
| B. | neither melting nor micro structural changes |
| C. | both melting and micro structural changes after solidification |
| D. | melting and retains the original micro structure after solidification |
| Answer» B. neither melting nor micro structural changes | |
| 396. |
During turning of a low carbon steel bar with TiN coated carbide insert, one needs to improve surface finish without sacrificing material removal rate. The achieve improved surface finish one should |
| A. | Decrease nose radius of the cutting tool and increase depth of cut |
| B. | Increase nose radius of the cutting tool |
| C. | Increase feed and reduce nose radius of the cutting tool |
| D. | Increase depth of cut and increase feed |
| Answer» C. Increase feed and reduce nose radius of the cutting tool | |
| 397. |
Two separate slab milling operations, 1 and 2, are performed with identical milling cutters. The depth of cut in operation 2 is twice that in operation 1. The other cutting parameters are identical. The ratio of maximum uncut chip thicknesses in operations 1 and 2 is |
| A. | 0.707 |
| B. | 0.767 |
| C. | 0.807 |
| D. | 0.709 |
| Answer» B. 0.767 | |
| 398. |
Consider the following statements: The helical flute in a twist drill provides the necessary |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 399. |
A 20 mm through hole is to be drilled in a 30 mm thick plate using a double fluted, 120 lip angle drill. The drill tip is at a distance of 3 mm from the plate surface when cutting is started and an over travel of 2 mm is recommended as a margin to ensure drilling through the full thickness of the plate. If the drill rotates at 500 rev/min and the feed per tooth is 0.01 mm, the machining time of the operation (in min) will be |
| A. | 4.5 |
| B. | 7.5 |
| C. | 9 |
| D. | 10.5 |
| Answer» B. 7.5 | |
| 400. |
A non standard thread of pitch 3.175 mm is to be cut on a lathe having lead screw of pitch 6 mm. A change gear set provided with the lathe has one gear each with the following number of teeth: 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 127. The correct pairs of change gears (a/b x c/d) for machining the given thread are (assuming that the transmission ratio of the rest of the kinematic train between the lathe spindle and lead screw is equal to 1), |
| A. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>20</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">30</td><td style="text-align: center;">80</td></tr></table> |
| B. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>20</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">40</td><td style="text-align: center;">120</td></tr></table> |
| C. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>30</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">20</td><td style="text-align: center;">120</td></tr></table> |
| D. | |
| E. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>30</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">50</td><td style="text-align: center;">80</td></tr></table> |
| Answer» C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>30</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">20</td><td style="text-align: center;">120</td></tr></table> | |